From 0684ffbea1dd857761bdad35813549f96c1af942 Mon Sep 17 00:00:00 2001
From: Havoc Pennington <hp@pobox.com>
Date: Sat, 19 Nov 2011 15:02:12 -0500
Subject: [PATCH] make "unresolved subst" exception suggest calling resolve()

this way it's clear what the problem is.
---
 .../java/com/typesafe/config/impl/ConfigSubstitution.java    | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/main/java/com/typesafe/config/impl/ConfigSubstitution.java b/src/main/java/com/typesafe/config/impl/ConfigSubstitution.java
index 2c5531e7..b75b680e 100644
--- a/src/main/java/com/typesafe/config/impl/ConfigSubstitution.java
+++ b/src/main/java/com/typesafe/config/impl/ConfigSubstitution.java
@@ -45,14 +45,15 @@ final class ConfigSubstitution extends AbstractConfigValue implements
     @Override
     public ConfigValueType valueType() {
         throw new ConfigException.NotResolved(
-                "tried to get value type on an unresolved substitution: "
+                "need to call resolve() on root config; tried to get value type on an unresolved substitution: "
                         + this);
     }
 
     @Override
     public Object unwrapped() {
         throw new ConfigException.NotResolved(
-                "tried to unwrap an unresolved substitution: " + this);
+                "need to call resolve() on root config; tried to unwrap an unresolved substitution: "
+                        + this);
     }
 
     @Override